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Carusotto, Fagnocchi, Recati, Balbinot and Fabbri report numerical evidence of Hawking emission of Bogoliubov phonons from a sonic horizon in a flowing one-dimensional atomic Bose-Einstein condensate. Hawking radiation is so weak that it has never been observed directly, so the work builds on the analogy between waves in moving media and fields in curved spacetime. The radiation shows up as distinctive long-range patterns in the gas's density-density correlation function. In the hydrodynamic limit their fully microscopic calculations agree quantitatively with analogue-model predictions. They predict new features and examine how robust the Hawking signal is at finite temperature.

Numerical observation of Hawking radiation from acoustic black holes in atomic Bose-Einstein condensates